Data transmission device and computer tomography equipment

Abstract

The embodiments of the present application provide a data transmission device and a computer tomography device, which relate to the field of computer tomography technology. The data transmission device includes a transmitting module, a receiving module, a transmitting antenna, and a receiving antenna; the transmitting module and the transmitting antenna are installed on the rotating part of the computer tomography device, and the receiving module and the receiving antenna are installed on the fixed part of the computer tomography device. The transmitting module converts the optical signal into an electrical signal, the transmitting antenna converts the electrical signal of the transmitting module into a wireless signal, the receiving antenna converts the wireless signal into an electrical signal, and the receiving module converts the electrical signal of the receiving antenna into an optical signal. The data transmission method is optical fiber + wireless contactless transmission, which takes into account the high bandwidth of optical fiber and the flexibility of wireless.

Description

Technical Field

[0001] The present application relates to the technical field of computer tomography, and in particular to a data transmission device and a computer tomography device. Background Art

[0002] Computed tomography (CT) equipment in the medical device field typically consists of an examination bed and a gantry. The bed supports the patient being examined and can move relative to the gantry. The gantry consists of a rotating portion and a fixed portion, with a certain air gap between them. Slip rings are designed to enable contactless communication between the rotating and fixed portions.

[0003] The earliest CT devices used cables to connect the rotating part and the fixed part to achieve power transmission and data acquisition. However, these cables would become entangled with each other when the rotating part rotated relative to the fixed part, resulting in a very small rotation angle range of the rotating part during each scan, limiting the effective scanning range.

[0004] Later, in order to overcome the problems of cable transmission, the slip ring system was introduced. In the traditional slip ring system, carbon brushes are used to contact metal rails for data transmission. However, due to the long-term wear of the carbon brushes and the metal rails, carbon powder will accumulate, resulting in unstable data communication, low transmission efficiency and high bit error rate.

[0005] In order to solve the above problems, the solution of non-contact conductive slip ring is introduced. Non-contact conductive slip ring can be divided into two types according to the signal transmission method: optical fiber type and wireless type. They have the following shortcomings:

[0006] 1. Fiber-optic conductive slip rings: (1) They need to maintain nanometer-level optical path alignment at the rotating interface, have a complex mechanical structure, and are expensive. Due to long-term rotation, they are prone to optical loss due to vibration and wear, and require regular calibration. (2) They have weak anti-pollution capabilities, are sensitive to dust and air gaps, have high sealing requirements, and have high subsequent maintenance costs. (3) They do not support power transmission.

[0007] 2. Wireless conductive slip rings: (1) Limited by the RF bandwidth, they are not suitable for high-frequency signal transmission and cannot meet the real-time transmission requirements of the detector raw data of CT equipment; (2) High-frequency wireless signals are easily interfered by reflections from metal frames.

[0008] How to design a data transmission device that has more advantages than the data transmission methods of pure optical fiber conductive slip rings and pure wireless conductive slip rings is a technical problem to be solved by this application. Summary of the Invention

[0009] The purpose of the present application is to provide a data transmission device and a computer tomography device, which have more advantages than the data transmission method of pure optical fiber conductive slip ring and the data transmission method of pure wireless conductive slip ring.

[0010] To achieve the above objectives, one or more embodiments of the present application adopt the following technical solutions.

[0011] In a first aspect, an embodiment of the present application provides a data transmission device, comprising a transmitting module, a receiving module, a transmitting antenna, and a receiving antenna; the transmitting module and the transmitting antenna can be mounted on a rotating portion of a computed tomography device, and the receiving module and the receiving antenna can be mounted on a fixed portion of the computed tomography device;

[0012] The transmitting module is used to receive a first optical signal from a first optical fiber and convert the first optical signal into a transmitting electrical signal; the transmitting antenna is connected to the transmitting module and is used to convert the transmitting electrical signal into a wireless signal; the receiving antenna is used to convert the wireless signal into a receiving electrical signal, the receiving antenna is connected to the receiving module and is used to convert the receiving electrical signal into a second optical signal for propagation in a second optical fiber;

[0013] The number of the transmitting antennas is greater than 1, and all the transmitting antennas can be arranged on a slip ring of the computed tomography device, and all the transmitting antennas are arranged in sequence and form a ring.

[0014] Optionally, each of the transmitting antenna and the receiving antenna consists of two signal lines;

[0015] The two signal lines in the transmitting antenna are parallel, with a spacing of 1 to 2.5 mm and a single width of 2 to 5 mm;

[0016] The two signal lines in the receiving antenna are arranged in parallel with a spacing of 0.5 to 2 mm, and the width of a single line is greater than the width of a single signal line in the transmitting antenna;

[0017] The frequency of the wireless signal ranges from 2.5 GHz to 10 GHz.

[0018] Optionally, the sending module includes a first optical module, a first signal amplifier, a 1:n signal buffer and a first resonance module connected in sequence;

[0019] The first optical module is used to convert the first optical signal transmitted by the first optical fiber into an alternating current signal; the first signal amplifier is used to convert the alternating current signal into a first current mode logic signal;

[0020] The number of the first resonant modules and the transmitting antennas is n, where n≥2 and is an integer. The 1:n signal buffer is used to copy the first current mode logic signal into n groups and transmit them to n first resonant modules respectively. The first resonant modules are connected to the transmitting antennas in a one-to-one correspondence. The first resonant module is used to filter the first current mode logic signal to obtain the transmitting electrical signal.

[0021] Optionally, the sending module further includes a first DC blocking capacitor and a second DC blocking capacitor;

[0022] The two input ends of the first signal amplifier are connected to the two output ends of the first optical module;

[0023] The first output terminal of the first signal amplifier is connected to the first input terminal of the 1:n signal buffer via the first DC blocking capacitor;

[0024] The second output terminal of the first signal amplifier is connected to the second input terminal of the 1:n signal buffer via the second DC blocking capacitor;

[0025] The gain of the first signal amplifier is 40 to 50 dB.

[0026] Optionally, each of the first resonant modules includes a first inductor-resistor unit, a second inductor-resistor unit, a third DC blocking capacitor, a fourth DC blocking capacitor, a common-mode inductor, a first capacitor, and a second capacitor; the first inductor-resistor unit and the second inductor-resistor unit each include an inductor and a resistor connected in series;

[0027] The data transmission device further includes a gold finger connector, the gold finger connector includes n groups of gold finger ports, each group of the gold finger ports includes a first gold finger port and a second gold finger port, the 1:n signal buffer includes n groups of signal output ends, each group of signal output ends includes a first signal output end and a second signal output end; each group of the signal output ends and each group of the gold finger ports have the following connection relationship:

[0028] The first inductor and resistor unit is connected between the first signal output terminal and the ground; the second inductor and resistor unit is connected between the second signal output terminal and the ground; the first capacitor is connected between the first port of the gold finger and the ground; the second capacitor is connected between the second port of the gold finger and the ground;

[0029] The first signal output end is connected to the first input end of the common-mode inductor through the third DC blocking capacitor; the first output end of the common-mode inductor is connected to the first port of the gold finger; the second signal output end is connected to the second input end of the common-mode inductor through the fourth DC blocking capacitor; the second output end of the common-mode inductor is connected to the second port of the gold finger.

[0030] Optionally, the sending module further includes a first power supply circuit and an LED lamp;

[0031] The first power supply circuit includes a first anti-reverse connection diode, a first self-recovery fuse, a first bidirectional transient suppression diode, a first X capacitor, a first Y capacitor, a first common-mode suppression coil group and a first DC / DC switching power supply chip; the number of the first Y capacitors is 2;

[0032] The first bidirectional transient suppression diode is connected between two input terminals of the first power supply circuit, the first X capacitor is connected between the two input terminals of the first power supply circuit, the first resettable fuse is connected between one input terminal of the first power supply circuit and the first X capacitor, and the first reverse polarity protection diode is connected to one input terminal of the first power supply circuit to prevent reverse polarity of the power supply; both input terminals of the first power supply circuit are grounded via the first Y capacitor;

[0033] The two input terminals of the first power supply circuit are connected to the first DC / DC switching power supply chip through the first common-mode suppression coil group;

[0034] The first optical module is externally connected to an LED light, and the first optical module controls the LED light to light up when the data signal is valid.

[0035] Optionally, the receiving module includes a second resonance module, an input module, a clock signal module, a second signal amplifier and a second optical module;

[0036] The second resonance module is used to filter the electrical signal of the receiving antenna to obtain the received electrical signal, the input module is used to convert the received electrical signal into a current mode logic differential signal, the clock signal module is used to control the output of the input module, the second signal amplifier is used to amplify the current mode logic differential signal to obtain a second current mode logic signal, and the second optical module is used to convert the second current mode logic signal into a second optical signal for propagation in the second optical fiber.

[0037] Optionally, a DISABLE function pin of the second signal amplifier is short-circuited with a LOS pin to automatically disable the output of the second current mode logic signal when the signal is weak; and a gain of the second signal amplifier is 40 to 50 dB.

[0038] Optionally, the receiving module further includes a second power supply circuit;

[0039] The second power supply circuit includes a second self-recovery fuse, a second bidirectional transient suppression diode, a second X capacitor, a second common-mode suppression coil group, a second anti-reverse connection diode and a second DC / DC switching power supply chip;

[0040] The second bidirectional transient suppression diode is connected between the two input terminals of the second power supply circuit, the second X capacitor is connected between the two input terminals of the second power supply circuit, the second resettable fuse is connected between one input terminal of the second power supply circuit and the second X capacitor, and the second reverse polarity protection diode is connected to one input terminal of the second power supply circuit to prevent reverse power supply.

[0041] Two input terminals of the second power supply circuit are connected to the second DC / DC switching power supply chip through the second common-mode suppression coil group.

[0042] In a second aspect, an embodiment of the present application provides a computed tomography device, which includes a rotating part, a fixed part and the data transmission device described in the first aspect, the sending module is installed on the rotating part, the receiving module is installed on the fixed part, and all the transmitting antennas are arranged in sequence and form a ring, which is circular or polygonal.

[0043] Compared with the prior art, this application has the following beneficial effects:

[0044] In the data transmission device provided in the embodiment of the present application, non-contact transmission is used between the sending module and the receiving module. Compared with contact transmission such as carbon brushes contacting metal rails, it avoids the problems of wear and high communication bit error rate, and takes into account the high bandwidth of optical fiber and the flexibility of wireless. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0046] Figure 1 A block diagram of a data transmission device provided in an embodiment of the present application;

[0047] Figure 2 A schematic diagram of an embodiment of the present application showing two transmitting antennas connected at one end and sharing an electrical signal;

[0048] Figure 3 A schematic diagram of an embodiment of the present application providing two independent transmitting antennas, each using an electrical signal;

[0049] Figure 4A schematic diagram of an embodiment of the present application providing three transmitting antennas, wherein two transmitting antennas share one electrical signal;

[0050] Figure 5 A schematic diagram of an embodiment of the present application providing a number of three transmitting antennas, wherein each transmitting antenna uses an electrical signal;

[0051] Figure 6 A data transmission device provided in an embodiment of the present application includes a schematic diagram of a gold finger connector;

[0052] Figure 7 A schematic diagram of an implementation scheme of a sending module provided in an embodiment of the present application;

[0053] Figure 8 A schematic diagram of the connection relationship between a first signal amplifier, a 1:2 signal buffer, and two first resonant modules provided in an embodiment of the present application;

[0054] Figure 9 A schematic diagram of an implementation of a first resonance module provided in an embodiment of the present application;

[0055] Figure 10 A schematic diagram of a first power supply circuit provided in an embodiment of the present application;

[0056] Figure 11 A schematic diagram of an implementation of a receiving module provided in an embodiment of the present application;

[0057] Figure 12 A schematic diagram of a second power supply circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0058] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. The described embodiments are part of the embodiments of the present application, but not all of the embodiments. Generally, the components of the embodiments of the present application described in the drawings herein can be arranged and designed in various different configurations.

[0059] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is claimed, but rather merely represents selected embodiments of the present application. All other embodiments derived by persons of ordinary skill in the art based on the embodiments in this application without creative effort are intended to fall within the scope of protection of this application. The following embodiments and features therein may be combined with each other unless there is a conflict.

[0060] In the description of this application, it is necessary to explain:

[0061] Relational terms such as first and second, etc., are used solely to distinguish one entity or operation from another entity or operation and do not necessarily require or imply any actual relationship or order between these entities or operations;

[0062] “Connection” should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0063] Figure 1 A block diagram of a data transmission device according to an embodiment of the present application is shown. The data transmission device includes a sending module, a receiving module, a transmitting antenna, and a receiving antenna. The sending module and the transmitting antenna are installed on the rotating part of the computed tomography equipment, and the receiving module and the receiving antenna are installed on the fixed part of the computed tomography equipment.

[0064] The transmitting module is configured to receive a first optical signal from a first optical fiber and convert the first optical signal into a transmit electrical signal. A transmitting antenna is connected to the transmitting module and is configured to convert the transmit electrical signal into a wireless signal. A receiving antenna is configured to convert the wireless signal into a receive electrical signal and is connected to the receiving module and is configured to convert the receive electrical signal into a second optical signal. The data transmission method of the data transmission device is: optical-electrical-wireless-electrical-optical.

[0065] Since the transmission between the sending module and the receiving module is non-contact, compared with contact transmission such as carbon brushes contacting metal tracks, it avoids problems such as wear and high communication bit error rate.

[0066] Since the transmitting module and the receiving module do not use optical fiber for direct transmission, there is no need to maintain nanometer-level optical path alignment at the rotating interface as required in pure optical fiber transmission. The mechanical structure of this solution has low cost and does not require regular calibration.

[0067] The transmitting antenna is mounted on a slip ring of the computed tomography system and rotates with it. If there is only one transmitting antenna, during one rotation, the transmitting antenna may be closer to the receiving antenna at times and farther away at other times. This distance compromises stable signal transmission.

[0068] In one embodiment, the number of transmitting antennas is set to 2, such as Figure 2 、 Figure 3 , the two transmitting antennas are arranged in sequence to form a ring. Figure 2 , one end of the two transmitting antennas can be connected, and the two transmitting antennas share an electrical signal. The black dot in the figure is the connection point, which is used for circuit connection and receiving electrical signals. Figure 3 , the two transmitting antennas can be made independent, and each of the two transmitting antennas uses an electrical signal.

[0069] In one embodiment, the number of transmitting antennas is set to 3, and all transmitting antennas are arranged in sequence to form a ring shape, and all transmitting antennas have the same length and are evenly arranged. Figure 4 , two of the transmitting antennas can be used as a group, one end of a group of transmitting antennas is connected, and a group of transmitting antennas share an electrical signal. The straight line in the figure represents the connection to the circuit. Figure 5 , each transmitting antenna can be made independent, and each transmitting antenna uses an electrical signal. The straight line in the figure represents the connection to the circuit.

[0070] This application does not limit the number of transmitting antennas, and the number of transmitting antennas can be greater than 1. Increasing the number of transmitting antennas is beneficial to signal transmission. All transmitting antennas are arranged in sequence and form a ring shape, which is beneficial to uniform signal transmission during rotation.

[0071] Each transmitting and receiving antenna consists of two signal lines. The two signal lines in each antenna are parallel, meaning they are equally spaced. The spacing between the two signal lines in the transmitting antenna ranges from 1 to 2.5 mm (1.5 to 1.7 mm is possible), and the width of each signal line is 2 to 5 mm (3 to 4 mm is possible). The spacing between the two signal lines in the receiving antenna ranges from 0.5 to 2 mm (0.8 to 1.5 mm is possible), and the width of each signal line is greater than that of the transmitting antenna. This antenna design allows for wireless signal frequencies ranging from 2.5 GHz to 10 GHz, ensuring excellent transmission. The transmitting antenna and receiving module utilize contactless transmission, and the distance between them can be set to 3 mm or between 1 and 5 mm, ensuring sufficient transmission efficiency.

[0072] Pure wireless transmission is limited by radio frequency bandwidth and cannot be applied to high-frequency signal transmission, making it difficult to meet the real-time transmission requirements of CT detector raw data. However, the optical-electrical-wireless-electrical-optical transmission method of this solution can shorten the wireless transmission distance and use high-frequency wireless signals, which can easily meet the real-time transmission requirements of CT detector raw data, and can meet the real-time transmission requirements of more sufficient data volumes without being prone to errors.

[0073] like Figure 6The transmitting module may include a first optical module, a first signal amplifier, a 1:n signal buffer (e.g., a 1:2 signal buffer) U4, and a first resonant module connected in sequence; the first optical module is used to convert a first optical signal transmitted by a first optical fiber into an alternating current electrical signal; the first signal amplifier is used to convert the alternating current electrical signal into a first current mode logic (CML) signal; the number of first resonant modules and transmitting antennas is n, where n is an integer and is greater than or equal to 2; the 1:n signal buffer is used to replicate the first CML signal into n groups and transmit them to n first resonant modules; the first resonant modules are connected to the transmitting antennas in a one-to-one correspondence; and the first resonant modules are used to filter the first CML signal to obtain a transmitting electrical signal.

[0074] like Figure 7 The first optical module can be connected to an external LED indicator. When the LED indicator is on, it means the data signal is valid. When the LED indicator is off, it means the data signal is invalid. The staff can intuitively judge the working status of the equipment according to the LED indicator.

[0075] like Figure 8 The sending module may further include a first DC blocking capacitor C1 and a second DC blocking capacitor C2, which have the following connection relationship: the two input ends of the first signal amplifier are connected to the two output ends of the first optical module; the first output end of the first signal amplifier is connected to the first input end of the 1:n signal buffer through the first DC blocking capacitor C1; the second output end of the first signal amplifier is connected to the second input end of the 1:n signal buffer through the second DC blocking capacitor C2.

[0076] The gain of the first signal amplifier may reach 50 dB, and the gain of the first signal amplifier may be 40 to 50 dB.

[0077] like Figure 8 The two output groups are connected to the two first resonant modules 1 in a one-to-one correspondence. Each group of signal output ends includes a first output end and a second output end. The first resonant module 1 can be connected to a gold finger connector, and the two transmitting antennas are connected through the gold finger.

[0078] Figure 8 The first resonant module 1 in the embodiment can be used as an implementation mode, and each first resonant module 1 includes two inductor-resistor units, and each inductor-resistor unit includes an inductor and a resistor connected in series.

[0079] In another embodiment, if Figure 9 The first resonance module may include the following parts: each first resonance module includes a first inductor resistance unit, a second inductor resistance unit, a third DC blocking capacitor and a fourth DC blocking capacitor, a common mode inductor, a first capacitor and a second capacitor; the first inductor resistance unit and the second inductor resistance unit both include an inductor and a resistor connected in series.

[0080] The first resonant module is connected to the gold finger connector, the gold finger connector includes n groups of gold finger ports, each group of gold finger ports includes a first gold finger port and a second gold finger port, the 1:n signal buffer includes n groups of signal output ends, each group of signal output ends includes a first signal output end and a second signal output end; Figure 9 , each group of signal output ports and each group of gold finger ports have the following connection relationship:

[0081] The first inductor-resistor unit is connected between the first signal output terminal and the ground; the second inductor-resistor unit is connected between the second signal output terminal and the ground; the first capacitor is connected between the first port of the gold finger and the ground; the second capacitor is connected between the second port of the gold finger and the ground;

[0082] The first signal output end is connected to the first input end of the common-mode inductor through the third DC blocking capacitor; the first output end of the common-mode inductor is connected to the first port of the gold finger; the second output end is connected to the second input end of the common-mode inductor through the fourth DC blocking capacitor; the second output end of the common-mode inductor is connected to the second port of the gold finger.

[0083] The first optical module, the first signal amplifier, the 1:n signal buffer, the first resonant module and the gold finger connector of the sending module can be arranged on a PCB board.

[0084] The sending module can also be set up with an independent power supply, such as Figure 7 The sending module may include a first power supply circuit. The first power supply circuit is used to provide power to various parts of the sending module. The first power supply circuit and other parts of the sending module may be arranged on a PCB board.

[0085] like Figure 10 The first power supply circuit may include a first resettable fuse, a first bidirectional transient voltage suppressor (TVS) diode, a first X capacitor, a first Y capacitor, a first common-mode suppression coil assembly, a first RLC filter circuit, and a first DC / DC switching power supply chip. In some embodiments, the capacitors and the first common-mode suppression coil assembly provide sufficient filtering, and the first RLC filter circuit may be omitted.

[0086] A first bidirectional transient suppression diode is connected between the two input terminals of the first power supply circuit, a first X capacitor is connected between the two input terminals of the first power supply circuit, and a first resettable fuse can be connected between one input terminal of the first power supply circuit and the first X capacitor. There are two first Y capacitors, and both input terminals of the first power supply circuit are grounded through one first Y capacitor. These components can effectively suppress the impact of external surges and electrical pulse groups on the equipment.

[0087] The first power supply circuit may further include a first anti-reverse polarity diode, which is connected to an input terminal of the first power supply circuit to prevent reverse polarity of the power supply. The first anti-reverse polarity diode may be connected to a position between the positive input terminal of the first power supply circuit and the input terminal of the first DC / DC switching power supply chip.

[0088] The two input ends of the first power supply circuit can be connected to the first DC / DC switching power supply chip through the first common-mode suppression coil group and the first RLC filter circuit, which can suppress high-frequency signals in the circuit.

[0089] The above is the introduction of the sending module. Figure 11 The receiving module may include a second resonance module, an input module, a clock signal module, a second signal amplifier and a second optical module. The second resonance module, input module, clock signal module, second signal amplifier and second optical module of the receiving module may be set on a PCB board.

[0090] The second resonance module is used to filter the electrical signal of the receiving antenna to obtain a received electrical signal, the input module is used to convert the received electrical signal into a current mode logic differential signal, the clock signal module is used to control the output of the input module, the second signal amplifier is used to amplify the current mode logic differential signal to obtain a second current mode logic signal, and the second optical module is used to convert the second current mode logic signal into a second optical signal for propagation in the optical fiber.

[0091] In the receiving module, the CML differential signal output by the front-end input module is susceptible to interference or unstable output voltage swing during transmission. Directly inputting the input module chip output signal into the optical module may cause data signal loss or errors, and invalid signals cannot be recognized. Therefore, a second signal amplifier is provided at the output end of the input module. The output of the input module can be processed by the second signal amplifier. The output of the input module can also be connected to the second signal amplifier via a fifth DC blocking capacitor.

[0092] The second signal amplifier can be configured to short the DISABLE pin with the LOS pin to automatically disable the output of the second current-mode logic signal when the signal is weak. The gain of the second signal amplifier can reach 50dB, and the gain of the second signal amplifier can be 40 to 50dB. Amplifier chips can be used for the first and second signal amplifiers.

[0093] The receiving module can also be equipped with an independent power supply, such as Figure 11The receiving module may include a second power supply circuit that provides power to various components of the receiving module. The second power supply circuit may be provided on a single PCB along with the other components of the receiving module. The second power supply circuit may include a second resettable fuse, a second bidirectional transient suppression diode, a second X capacitor, a second common-mode suppression coil assembly, a second RLC filter circuit, and a second DC / DC switching power supply chip. In some embodiments, the capacitor and the second common-mode suppression coil assembly provide sufficient filtering, and the second RLC filter circuit may be omitted.

[0094] like Figure 12 A second bidirectional transient suppression diode is connected between the two input terminals of the second power supply circuit, a second X capacitor is connected between the two input terminals of the second power supply circuit, and a second resettable fuse is connected between one input terminal of the second power supply circuit and the second X capacitor, which can effectively suppress the impact of external surges and electrical pulse groups on the equipment;

[0095] The two input ends of the second power supply circuit can be connected to the second DC / DC switching power supply chip through the second common-mode suppression coil group and the second RLC filter circuit, which can suppress high-frequency signals in the circuit.

[0096] The second power supply circuit may also include a second anti-reverse polarity diode connected to an input terminal of the second power supply circuit to prevent reverse polarity. The second anti-reverse polarity diode may be connected between the positive input terminal of the second power supply circuit and the input terminal of the second DC / DC switching power supply chip. This solution uses a capacitor to smooth the output voltage to provide a stable DC voltage and prevent voltage fluctuations from affecting circuit performance.

[0097] The second power supply circuit can also include an LDO chip. The second DC / DC switching power supply chip can be a DC / DC switching power supply chip that outputs a DC5.0V DC voltage. The DC5.0V DC voltage then outputs a DC3.3V voltage through the LDO chip to power the chip and optical module on the receiving module.

[0098] Based on the above embodiments, the embodiments of the present application also provide a computed tomography scanning device, which includes a rotating part, a fixed part and the above-mentioned data transmission device, wherein the sending module of the data transmission device is installed on the rotating part, and the receiving module of the data transmission device is installed on the fixed part.

[0099] In general, this application proposes a hybrid (fiber + wireless) non-contact conductive slip ring as a data transmission device for computed tomography equipment, which can achieve the following beneficial effects:

[0100] (1) Solve the following problems of traditional slip ring systems: Traditional slip ring systems use carbon brushes to contact metal rails for data transmission. Friction is prone to interference, and due to long-term wear of the carbon brushes and metal rails, carbon powder will accumulate, resulting in unstable data communication, low transmission rate (generally less than 1Gbps), and high bit error rate.

[0101] (2) Taking into account the high bandwidth of optical fiber and the flexibility of wireless:

[0102] Compared with pure optical fiber transmission, photoelectric conversion only needs to be completed at the rotating end, avoiding direct optical coupling at the rotating interface. The mechanical structure requirements are lower, and the signal can be transmitted to the antenna through the gold finger. The mechanical tolerance is larger, the signal transmission is more stable and reliable, and the vibration resistance is stronger. The rotation alignment accuracy requirements are lower, and there is no need for regular calibration. The gold finger and wireless module are easy to replace, and the subsequent maintenance cost is low.

[0103] Compared with pure wireless transmission: it can support higher frequency signal transmission and is suitable for CT equipment with high-speed and high-reliability requirements. Specifically, it can adapt to high-frequency signal transmission of 2.5GHz-10GHz, with faster and more stable transmission rates, lower bit error rates, and more detailed information contained in high-frequency signals. Both the sending module and the receiving module can be equipped with signal amplifiers to avoid signal loss during transmission and cause signal instability. Therefore, it can provide more detailed and accurate image information for subsequent CT imaging, which is beneficial to improving the accuracy of disease diagnosis in clinical practice and can be suitable for the new generation of high-speed and high-stability CT (computed tomography) equipment.

[0104] (3) Fiber optic + gold finger + wireless design. The gold finger can be used for both power transmission and signal transmission. The design is flexible and can meet the needs of high bandwidth, high stability and low cost at the same time.

[0105] (4) Both the transmitting module and the receiving module can be equipped with a resonant circuit to select a high-frequency signal of a specific frequency, which can be a high-frequency signal of 2.5GHz-10GHz. On the one hand, it can filter out clutter, avoid wireless interference problems in all aspects, and improve the anti-interference ability of wireless transmission. On the other hand, it can be suitable for the new generation of high-speed and high-stability CT (computed tomography) equipment.

[0106] (5) The design of independent power supply can effectively suppress the impact of external surge and electric pulse group on the equipment: the sending module and the receiving module are both equipped with independent power supply, and the power input part is equipped with self-recovery fuse, TVS tube, X capacitor and Y capacitor, which can effectively suppress the impact of external surge and electric pulse group on the equipment; secondly, the power input adopts multiple common mode suppression coils and RLC filter circuits to suppress the high-frequency signal in the circuit; the input end is connected with a unidirectional diode, which can effectively prevent the module from being burned due to reverse connection of the power supply; an electrical signal filtering circuit is set between the power supply and each chip. In this design scheme, capacitor filtering is adopted, and the output voltage is smoothed by capacitors to provide a stable DC voltage to avoid the impact of voltage fluctuations on circuit performance.

[0107] The above-described device and system embodiments are merely illustrative, and some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment. Those skilled in the art may understand and implement the present invention without inventive effort.

[0108] The above are merely preferred embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A data transmission device, characterized in that: It includes a sending module, a receiving module, a transmitting antenna and a receiving antenna; The transmitting module is used to receive a first optical signal from a first optical fiber and convert the first optical signal into a transmitting electrical signal; the transmitting antenna is connected to the transmitting module and is used to convert the transmitting electrical signal into a wireless signal; the receiving antenna is used to convert the wireless signal into a receiving electrical signal, the receiving antenna is connected to the receiving module and is used to convert the receiving electrical signal into a second optical signal for propagation in a second optical fiber; The number of the transmitting antennas is greater than 1, and all the transmitting antennas are arranged in sequence and form a ring; The transmitting module includes a first optical module, a first signal amplifier, a 1:n signal buffer and a first resonance module connected in sequence; The first optical module is used to convert the first optical signal transmitted by the first optical fiber into an alternating current signal; the first signal amplifier is used to convert the alternating current signal into a first current mode logic signal; The number of the first resonant modules and the transmitting antennas is n, where n≥2 and is an integer. The 1:n signal buffer is used to copy the first current mode logic signal into n groups and transmit them to n first resonant modules respectively. The first resonant modules are connected to the transmitting antennas in a one-to-one correspondence. The first resonant module is used to filter the first current mode logic signal to obtain the transmitting electrical signal.

2. The data transmission device according to claim 1, wherein Each of the transmitting antenna and the receiving antenna is composed of two signal lines; The two signal lines in the transmitting antenna are parallel, with a spacing of 1 to 2.5 mm and a single width of 2 to 5 mm; The two signal lines in the receiving antenna are arranged in parallel with a spacing of 0.5 to 2 mm, and the width of a single line is greater than the width of a single signal line in the transmitting antenna; The frequency of the wireless signal ranges from 2.5 GHz to 10 GHz.

3. The data transmission device according to claim 1, wherein The sending module further includes a first DC blocking capacitor and a second DC blocking capacitor; The two input ends of the first signal amplifier are connected to the two output ends of the first optical module; The first output terminal of the first signal amplifier is connected to the first input terminal of the 1:n signal buffer via the first DC blocking capacitor; The second output terminal of the first signal amplifier is connected to the second input terminal of the 1:n signal buffer via the second DC blocking capacitor; The gain of the first signal amplifier is 40 to 50 dB.

4. The data transmission device according to claim 1, wherein: Each of the first resonant modules includes a first inductor-resistor unit, a second inductor-resistor unit, a third DC blocking capacitor, a fourth DC blocking capacitor, a common mode inductor, a first capacitor, and a second capacitor; the first inductor-resistor unit and the second inductor-resistor unit each include an inductor and a resistor connected in series; The data transmission device further includes a gold finger connector, the gold finger connector includes n groups of gold finger ports, each group of the gold finger ports includes a first gold finger port and a second gold finger port, the 1:n signal buffer includes n groups of signal output ends, each group of signal output ends includes a first signal output end and a second signal output end; each group of the signal output ends and each group of the gold finger ports have the following connection relationship: The first inductor and resistor unit is connected between the first signal output terminal and the ground; the second inductor and resistor unit is connected between the second signal output terminal and the ground; the first capacitor is connected between the first port of the gold finger and the ground; the second capacitor is connected between the second port of the gold finger and the ground; The first signal output end is connected to the first input end of the common mode inductor through the third DC blocking capacitor; the first output end of the common mode inductor is connected to the first port of the gold finger; The second signal output end is connected to the second input end of the common mode inductor through the fourth DC blocking capacitor; the second output end of the common mode inductor is connected to the second port of the gold finger.

5. The data transmission device according to claim 1, wherein: The sending module also includes a first power supply circuit and an LED lamp; The first power supply circuit includes a first anti-reverse connection diode, a first self-recovery fuse, a first bidirectional transient suppression diode, a first X capacitor, a first Y capacitor, a first common-mode suppression coil group and a first DC / DC switching power supply chip; the number of the first Y capacitors is 2; The first bidirectional transient suppression diode is connected between two input terminals of the first power supply circuit, the first X capacitor is connected between the two input terminals of the first power supply circuit, the first resettable fuse is connected between one input terminal of the first power supply circuit and the first X capacitor, and the first reverse polarity protection diode is connected to one input terminal of the first power supply circuit to prevent reverse polarity of the power supply; both input terminals of the first power supply circuit are grounded via the first Y capacitor; The two input terminals of the first power supply circuit are connected to the first DC / DC switching power supply chip through the first common-mode suppression coil group; The first optical module is connected to the LED light, and the first optical module controls the LED light to light up when the data signal is valid.

6. The data transmission device according to claim 1, wherein: The receiving module includes a second resonance module, an input module, a clock signal module, a second signal amplifier and a second optical module; The second resonance module is used to filter the electrical signal of the receiving antenna to obtain the received electrical signal, the input module is used to convert the received electrical signal into a current mode logic differential signal, the clock signal module is used to control the output of the input module, the second signal amplifier is used to amplify the current mode logic differential signal to obtain a second current mode logic signal, and the second optical module is used to convert the second current mode logic signal into a second optical signal for propagation in a second optical fiber.

7. The data transmission device according to claim 6, wherein: The DISABLE function pin of the second signal amplifier is short-circuited with the LOS pin to automatically disable the output of the second current mode logic signal when the signal is weak; the gain of the second signal amplifier is 40 to 50 dB.

8. The data transmission device according to claim 6, wherein: The receiving module further includes a second power supply circuit; The second power supply circuit includes a second self-recovery fuse, a second bidirectional transient suppression diode, a second X capacitor, a second common-mode suppression coil group, a second anti-reverse connection diode and a second DC / DC switching power supply chip; The second bidirectional transient suppression diode is connected between the two input terminals of the second power supply circuit, the second X capacitor is connected between the two input terminals of the second power supply circuit, the second resettable fuse is connected between one input terminal of the second power supply circuit and the second X capacitor, and the second reverse polarity protection diode is connected to one input terminal of the second power supply circuit to prevent reverse power supply. Two input terminals of the second power supply circuit are connected to the second DC / DC switching power supply chip through the second common-mode suppression coil group.

9. A computer tomography device, characterized in that: The computed tomography equipment includes a rotating part, a fixed part and the data transmission device according to any one of claims 1 to 8, the sending module is installed on the rotating part, the receiving module is installed on the fixed part, all the transmitting antennas are arranged on the slip ring of the computed tomography equipment, and all the transmitting antennas are arranged in sequence and form a ring, which is a circle or a polygon.

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